Kavad II vs King Helu of Wu

Kavad II, then known as Sheroe, led a coup against his father Khosrow II, imprisoning and later executing him. This act ended Khosrow's long reign and the Sasanian-Byzantine war, but plunged the empire into civil war and decline.

Kavad II ordered the execution of 17 of his brothers to eliminate potential rivals to the throne. This massacre decimated the Sasanian royal family and weakened the dynasty's legitimacy, contributing to the empire's instability.

Kavad II negotiated a peace treaty with the Byzantine Empire, ending the decades-long war. The treaty restored pre-war borders and returned the True Cross to Jerusalem, but the Sasanian Empire was left exhausted and weakened.

King Helu of Wu appointed Sun Tzu as his general after Sun Tzu demonstrated his military discipline by executing two of the king's favored concubines. This decision brought Sun Tzu's strategic expertise to the Wu military, leading to successful campaigns.

King Helu led Wu forces to a decisive victory over the Chu state at Boju. Using Sun Tzu's tactics, Wu captured the Chu capital Ying, forcing King Zhao of Chu to flee. This victory established Wu as a major power in the Spring and Autumn period.

King Helu invaded the Yue state but was defeated at the Battle of Zuili. He was wounded by an arrow during the battle and died shortly after. His death led to his son Fuchai ascending the throne, who later sought revenge against Yue.